The Synergic Solvent Extraction of Rare Earths. II. The Absorption Spectra of Neodymium-, Holmium-, and Erbium-TTA-TOPO Complexes with ClO<SUB>4</SUB><SUP>−</SUP>, CNS<SUP>−</SUP> , NO<SUB>3</SUB><SUP>−</SUP>, and Cl<SUP>−</SUP> Ions
スポンサーリンク
概要
- 論文の詳細を見る
The synergic solvent extraction behavior of neodymium, holmium, and erbium in Ln<SUP>3+</SUP>/X<SUP>−</SUP>/HTTA/TOPO systems (X<SUP>−</SUP>=ClO<SUB>4</SUB><SUP>−</SUP>, CNS<SUP>−</SUP>, NO<SUB>3</SUB><SUP>−</SUP>, and Cl<SUP>−</SUP>) have been investigated. When the rare earths are completely extracted into an organic layer, the following equation is assumed:<BR>Ln(TTA)<SUB>3</SUB>(TOPO)<SUB>2(0)</SUB>+3TOPO<SUB>(0)</SUB>+H<SUB>(a)</SUB><SUP>+</SUP>+X<SUB>(a)</SUB><SUP>−</SUP>\rightleftharpoons(Ln(TTA)<SUB>2</SUB>(TOPO)<SUB>5</SUB>)<SUP>+</SUP>X<SUB>(0)</SUB><SUP>−</SUP>+HTTA<SUB>(0)</SUB><BR>for which the mixed equilibrium constant is defined by <I>k</I><SUB>3</SUB>=[(Ln(TTA)<SUB>2</SUB>(TOPO)<SUB>5</SUB>)<SUP>+</SUP>X<SUP>−</SUP>]<SUB>(0)</SUB> [HTTA]<SUB>(0)</SUB>/[Ln(TTA)<SUB>3</SUB>-(TOPO)<SUB>2</SUB>]<SUB>(0)</SUB>[TOPO]<SUP>3</SUP><SUB>(0)</SUB> [H<SUP>+</SUP>]<SUB>(a)</SUB>[X<SUP>−</SUP>]<SUB>(a)</SUB>. The log<I>k</I><SUB>3</SUB> value for the holmium/ClO<SUB>4</SUB><SUP>−</SUP>, /CNS<SUP>−</SUP>, /NO<SUB>3</SUB><SUP>−</SUP>, and /Cl<SUP>−</SUP> systems are about 8.3, 6.5, 5.3, and 3.6 respectively. An obvious difference between Ln<SUP>3+</SUP>/SO<SUB>4</SUB><SUP>2−</SUP>/HTTA/TOPO and Ln<SUP>3+</SUP>/ClO<SUB>4</SUB><SUP>−</SUP>/HTTA/TOPO systems is observed in the order of the distribution ratio on the extraction of a series of rare earths with an increase in the atomic number.
- 公益社団法人 日本化学会の論文
著者
-
Ohkura Nobuyo
College of General Education, Kyushu University
-
Taketatsu Tomitsugu
College of General Education, Kyushu University